Method of forming patches for rubber articles.



J. G. MOOMY.

METHOD OF FORMING PATCHES FOR RUBBER ARTICLES. A'PPLIQATION FILED FEB.21,1913.

1,1 1 1 ,802, Patented Sept. 29, 1914.

2 SHEETSSHEET 1.

J. G. MOOMY METHOD OF FORMING PATCHES FOR RUBBER ARTICLES.

APPLICATION FILED FEB.21, 1913.

1, 1 1 1,802. Pa ented Sept. 29, 1914.

2 SHEETSSHEET 2.

308E253 .G. rrooMY, or arn, PnNNsvLvANIn.

METHOD FORMING- PATCHES FOR RUBBER ARTICLES.

furnace.

Specification. of Letters Patent.

Patented Sept. 29, 1914.

Application filed February 21,1913. Serial No. 749,844.

To all whom it may concern:

Be it known that I, JOSEPH G. MOOMY, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvements in the Method of- Forming Patches for Rubber Articles, of which the following is a specification.

This invention relates to the method of forming patches for rubber articles and consists in certain improvements therein as will be hereinafter fully described and pointed out in the claims. p

The object of the invention is to form patches havin one surface vulcanized and the other s'ur ace raw rubber, the body of the patch forming a unitary mass varying in quality from the raw rubber of one surface to the vulcanized rubber of the opposite surface. The method further involves a convenient manner of mounting such patches.

The article formed by this process, or at least parts of this process forms the subject matter of another application filed March 26th, 1912, Serial Number 686,282.

The parts and apparatus involved in carrying out the process are illustrated in the accompanying drawings as follows Figure 1 shows a plan view of the smaller layer of vulcanizing stock. Fig. 2 a side elevation of the same. Fig. 3 a plan view of a layer of vulcanizing stock. Fig. l a side elevation of the same. Fig. 5 a plan view of'a layer of nonvulcanizing stock. Fig. 6 a side elevation of the same. Fig. 7 a plan view of these several layers associated. Fig. 8 a side elevation of the difierent layers placed together preparatory to vulcanizi-ng. Fig. a plan view of the patchesmounted on muslin. Fig. 10 a side elevation of the parts as shown in Fig. 9. Fig. 11 a section on the line 1111 in Fig. 12 of a drum on which the patches are placed for vulcanization. 'Fig.

12 a section on the line l212 in Fig. 11. I

Fig. 13 a vulcanizer, the shell being partly broken away to show the structure. Fig. 14 a plan view of the fabric a, having the patches thereon after vulcamzing withone of the patches removed. Fig. 15 a section on the line 1515 in Fig. 1t.

The layers 1 and 2 are of vulcanizing stock, that is, the rubber is combined with material which will effect vulcanization under heat. The object in forming the layer 1 of smaller dimensions than the layer 2 is to give to the finished product a. beveled edge. The layer 3 is of nonvulcanizing stock. After the difl'erent layers are associated as in Fig. 8 they are placed on a fabric 4 as shown in Fig. 9. This fabric is preferably glazed fabric, ordinarily glazed muslin. Fig. 10 shows a side elevation of the parts shown in Fig. 9. After the patches are placedon the muslin 4 they are wrapped on a drum 5, said drum having an imperforate surface 6, ordinarily galvanized iron. The patches are put under pressure by winding a muslin strip 7 around the drum and overthe patches. The drum having the muslin with the patches mounted on it is thenplaced in the vulcanizing heater as shown in Fig. 13, and steam is turned into the vulcanizer in the ordinary manner. If

.a glazed fabric 4 is used and this is put on a drum having an imperforate surface 6, the glazed fabric in connection with the surface and the superimposed patch being vulcanized forms a seal which excludes the moisture from that part of the muslin between the raw patch and the imperforate surface. The result is that the nonvulcanizing stock does not penetrate the muslin sufficiently to prevent its ready removal from the muslin.

In Fig. 14: I have shown a part of the muslin P which has thus been scaled from the moisture and this retains the glazed surface which permits of the ready removal of the patch. In the exposed parts of the muslin the glaze is removed through. the action of the steam in thevulcanizing process.

- In the vulcanizing process the layer 1 0f vulcanizin stock and the edges of the layer 2 under t e influence of the wrapping of muslin forms a beveled surface such as shown in Fig. 15. What Iclaim as new is 1. The method of forming patches for rubber articles which consists in forming a layer of raw rubber and a layer of stock compounded to vulcanize under heat; placing said layers together face to face; and vulcanizing and uniting the associated layers by heat to form a patch, having one surface vulcanized rubber and the other surface raw rubber.

2. The method of forming patches for rubber articles which consists in forming a layer of raw rubber a layer of stock compounded to vulcanize under heat and approximating the size of the layer of raw rubber, and a second layer of stoclt compounded to vulcanize under heat arranged on the first layer of vulcanizing stock, said second layer being of smaller dimensions than the first layer; placing the three layers together face to face with the two layers of vulcanizing stock in contact and the layer of raw rubber on the larger layer of vulcanizing stock; and vulcanizing and uniting the associated layers by heat While subjecting the layers to pressure and causing the edge to flow to form a patch with beveled edge and having one surface vulcanized rubber and the other surface raw rubber.

3. The method of forming patches for rubber'articles'which consists in forming a layer of raw rubber and a layer of stock compounded to vulcanize under heat;

Witnesses.

JOSEPH G. MOOMY.

Witnesses:

B. M. HARTMAN, THOMAS C. MILLER. 

